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Bubblers questions

I have 6 trees (approx 14 ft diam at drip line) that each require up to 200 gal of water per watering (every 2 weeks in summer and every 4 weeks in winter ) .. ( I live in Phoenix, hence the desert watering schedule) All my other irrigation valves are centrally located and I want to keep the one for the trees in the same area as the others. That means the trees are about 130 feet from the valves, very flat level grade the whole way. I want to use regular bubblers and flood them ( not drip unless someone can make a convincing arguemnt for it …and then tell me what I’ll need). They all have wells to their drip lines.

1) will I need to drop the line pressure (a regulator)? 2) what diam (and pressure?) size pvc do I need?3) Should I keep them all on one valve split them and do three trees per valve?4) how many bubblers per tree (optimal) ?5) I am homeowner (not pro), a gal, and pretty handy with tools , but not super big and strong :-)

You can run one of the existing zones, and take a pressure reading at the house, followed by reading the flow at the outdoor water meter. That will define your water supply. If you want to do this precisely, you'll get a bubbler or two, and run them from a hose-end adapter, and see how much run time gives you how much spread of water.